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浅埋隧道贯通前相向的工作面可能相互影响,导致围岩稳定性变差。为此,利用刚体滑块极限分析上限法进行稳定性分析,构造了隧道双向开挖工作面纵向二维刚体滑块体系破坏模式,推导了破坏模式与附属速度场的几何关系,并确定了相应几何参数的约束条件,基于上限原理获得浅埋隧道工作面支护反力的目标函数,通过建立线性规划模型,得到了多种工况下双向开挖工作面贯通前隧道工作面临界支护反力系数的变化规律及破坏模式图表,并探讨了影响工作面稳定的多种因素。
Shallow tunnel through the front of the opposite face may affect each other, resulting in poor stability of the surrounding rock. Therefore, the stability analysis of the rigid body slider upper bound method is carried out. The failure mode of longitudinal two-dimensional rigid-body slider system is established, and the geometric relation between the failure mode and the subsidiary velocity field is deduced. The objective function of the reaction force of shallow tunnel face is obtained based on the upper bound principle by means of the constraints of geometric parameters and the upper bound principle. By establishing the linear programming model, the bifurcated excavation face The coefficient of variation of the force coefficient and the failure mode chart, and discusses the factors that affect the stability of the working face.